JPH0531537A - Working method for hard-to-work thin metallic plate - Google Patents

Abstract

PURPOSE:To prevent work from giving uneven extensional deformation like a deep draw forming by giving many small extensional deformations on the entire recessed part of a thin plate by means of a punch to form the recessed part and specifying the extent of one time work to form dents on the thin plate with the punch. CONSTITUTION:By repeating the work to form dents 3 on the thin plate 1 with the punch 14 that has a small cross-sectional area compared with the bottom area of the recessed part 2, the work, in which a part of the thin plate is overhung in the same plane shape as the recessed part, is performed in plural parts. The method is comprised of a first process, in which the recessed part is formed on the thin plate while successively increasing the depth of an overhang for each work, and a second process, in which the thin plate is placed on the receiving body of the punch, a finishing die is pushed in the recessed part of the thin plate and the recessed part is finished into a final shape. The first process is provided with plural kinds of the punches 14, and a punch work is performed by selecting and changing these punches. Thus, the punch work is efficiently performed, and the highly accurate receed part is promptly formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a recess on a thin plate made of a difficult-to-process metal by pressing.

The term "metal" as used herein means a pure metal and an alloy thereof.

[0003]

2. Description of the Related Art Recently, in the industry, it is required to increase the strength and toughness of light metal materials, and Al alloy, Mg alloy, Ti,
Applications of high strength metals such as Ti alloys are increasing. Along with this, the demand for products in which a recess is formed in a thin plate made of these high-strength light metals is also increasing.

Conventionally, in order to form a recess in a thin plate made of high-strength light metal, deep drawing by pressing has been adopted.

[0005]

Problems to be Solved by the Invention Al alloy, Mg alloy,
High-strength light metals such as Ti and Ti alloys have high strength, but have poor formability, and are called difficult-to-process metals. For this reason, the processing method of forming a recess by deep drawing in a thin plate made of a high-strength light metal, that is, a hard-to-process metal has the following problems.

The deep drawing is a method in which a punch and a die are used, a plate is placed on the die, and a thin plate is pushed into the die by the punch to form a concave portion.
That is, in deep drawing, a punch having a cross-sectional area of the same size as the bottom surface of the recess to be formed is used, and the punch is used to project and form the recess.

Therefore, the recess of the thin plate formed by the punch is deformed by receiving a tensile force in the radial direction and a compressive force in the circumferential direction. That is, when the concave portion is formed, the bottom surface of the concave portion is pushed by the bottom surface of the punch and moves in the concave portion projecting direction as the punch moves. It is stretched by being pulled in the overhang direction.

However, since the difficult-to-machine metal has poor elongation characteristics, if a pulling force is applied to the peripheral surface of the recess when the recess is formed, the peripheral surface of the recess copes with this tensile force and is sufficiently moved in the projecting direction. It cannot extend, and as a result, cracks may occur in the peripheral surface of the recess.

When a recess is formed in a thin plate made of a difficult-to-process metal by deep drawing, a crack is generated in the recess and the processing yield is low.

The present invention has been made in view of the above circumstances, and it is possible to form a concave portion reasonably and efficiently on a thin plate made of a difficult-to-process metal, and to prevent the occurrence of cracks due to the formation of the concave portion, which results in high quality. It is an object of the present invention to provide a method for processing a difficult-to-process metal thin plate from which a product can be obtained.

[0011]

In order to achieve the above-mentioned object, a method of processing a difficult-to-process metal thin plate of the present invention is a method of forming a concave portion protruding from this thin plate on a thin plate made of a difficult-to-process metal. A punch having a cross-sectional area smaller than the area of the bottom surface of the recess and a receiving body surrounding the punch, and a punch receiving body for receiving the punch are prepared, and the punch is pressed by the pressing body while pressing the thin plate. The thin plate is pushed toward the punch receiving body with a depth dimension smaller than the depth dimension of the recess to form a recess in the thin plate, and the thin plate is projected in the same planar shape as the recess. The first step of forming the concave portion in the thin plate while performing the concave portion forming processing in plural times and sequentially increasing the overhang depth for each of the concave portion forming processing, and having the same size and shape as the concave portion. A second step of preparing a raising die and a die receiving body for receiving this finishing die, placing the thin plate on the die receiving body, and pushing the finishing die into the concave portion of the thin plate to finish the concave portion into a final shape. In the first step, in the step of forming a depression in the thin plate with the punch, a value obtained by dividing a depth at which the punch presses the thin plate by a diameter of the punch is 0.1% to 30%. The first step is characterized in that a plurality of types of punches are prepared, and these punches are selected and replaced according to the progress of processing.

[0012]

According to the processing method of the present invention, the entire recess is formed by stacking a plurality of small expansion deformations on the thin plate by the punch, and not only the peripheral surface of the recess is extended but also the bottom is extended. To form a recess. Further, the working degree of one-time processing for forming a depression in a thin plate by a punch is specified so that this processing does not give uneven elongation deformation to the substrate unlike the deep drawing processing. Therefore, the substrate can be reasonably deformed and the concave portion can be projected to be deformed.

In particular, in the first step, a plurality of types of punches are prepared, and the punches are selected and exchanged according to the progress of the machining to perform the machining. It is possible to quickly form a high recess. Further, a recess having a complicated shape can be easily formed by selecting the type of punch.

Examples of the difficult-to-process metal targeted by the present invention include light metals such as Al alloy, Mg alloy, Ti, and Ti alloy.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A working method according to the present invention will be described below with reference to an embodiment shown in the drawings.

In this embodiment of the processing method, as shown in FIG. 23, a recess 2 having a plane rectangular shape is formed in a thin plate 1 made of a difficult-to-process metal.
The method is intended to form. A pair of groove portions 4 are formed on the bottom surface of the recess 2.

A processing apparatus used in the processing method of this embodiment will be described with reference to FIGS.

10 is a base, 11 is a punch unit supported by a frame 13 provided on the upper surface of the base 10, and 1 is a punch unit.
Reference numeral 2 denotes a receiver unit provided directly below the punch unit 11 and provided on the base 10.

The punch unit 11, as shown in FIGS. 8 and 9, has a column-shaped punch 14 arranged vertically.
The punch 14 is provided with a plurality of arcuate pressing bodies 15 arranged around the punch 14 and a unit main body 11a to which the pressing bodies 15 are attached. The punch 14 forms the recess 3 in the thin plate 1, and has a much smaller area than the area of the bottom surface of the recess 2 of the thin plate 1, for example, 1/25 of the recess 2. When the punch 14 forms a recess in the thin plate 1, the presser body 15 presses a portion of the thin plate 1 located around the punch 14 to enable the formation of the recess 3 and also to suppress the occurrence of wrinkles in the recess 3. Is. The punch 14 and the pressing members 15 are individually driven and lifted by, for example, pneumatic cylinders (not shown).

Plural kinds of punch units 11 are prepared, and they are selected and used according to the progress of punching. The configuration for this will be described later.

As shown in FIGS. 8 and 9, the receiving body unit 12 is a punch receiving body 16 in the form of a cylinder arranged in the vertical direction, and a plurality of arc-shaped punching bodies surrounding the punch receiving body 16. A pressing body 17 is provided. The punch receiver 16 receives the punch 14 through the thin plate 1 when the punch 14 forms a recess in the thin plate 1.
It has a diameter slightly larger than the diameter of. Presser body 17
Is for allowing the punch 14 to form a recess in the thin plate 1 by pressing the punch-side pressing body 15 and the portion of the thin plate 1 located around the punch 14 to form the recess 3. The punch receiving member 16 and each pressing member 17 are individually driven and moved up and down by, for example, a pneumatic cylinder (not shown).

The processing apparatus is equipped with a finishing die 36 used in a finishing step when forming the recess 2 of the thin plate 1 and a die receiver 37 for receiving the die 36, and drives the finishing die 36, for example, not shown. A pneumatic cylinder is provided.

A mechanism for horizontally holding and moving the thin plate 1 between the punch 14 and the punch receiver 16 will be described. In the figure, 18 is a lift plate horizontally arranged above the base 11,
A guide rod 19 provided upright on the base 10 is supported so as to be vertically movable (Z direction). Reference numeral 20 is a feed screw provided along the up-down direction, and the feed screw 20 is screwed into a screw hole provided in the elevating plate 19. Lead screw 20
Is rotated by a motor 21 supported by a member (not shown).

Reference numerals 22, 23, and 24 denote moving bodies, and these moving bodies 22, 23, and 24 are arranged at intervals in the X direction on the lift plate 18, and guides laid on the lift plate 18 along the Y direction. The rail 25 is movably supported. Reference numeral 26 denotes a feed screw arranged along the X direction, and the feed screw 26 is screwed into a screw hole provided in the transfer body 22. The feed screw 26 is rotated by a motor 27 provided on the lift plate 18.

Reference numeral 28 is a feed screw arranged along the X direction in the drawing, and the feed screw 28 is screwed into the screw holes provided in the moving bodies 22, 23 and 24. A motor (not shown) is mounted on the moving body 24, and the feed screw 28 is driven by this motor.
Is rotated and moved in the X direction. 29 is a guide rod,
The movable bodies 22 and 23 are movably inserted in the X direction. The tip of the feed screw 28 has a holder 3 for holding the thin plate 1.
It is rotatably supported and connected to 0. Guide rod 29
Supports the holder 30 with its tip fixed to the holder 30.

Reference numerals 30 and 31 are a pair of holders for holding the thin plate 1. One holding body 30 is supported by the feed screw 28 and the guide rod 29. 32 and 33 are a pair of feed screws arranged along the X direction.
Numerals 2 and 33 are rotatably and movably supported on both ends of the holder 30. The feed screws 32 and 33 are the holding body 30.
It is rotated by motors (not shown) provided at both ends of, and is moved in the X direction with this rotation. Each holder 30, 31
A pair of holding bodies 34, 34 are attached to the opposite side portions of each of the. These sandwiches 34, 34 are thin plates 1
The thin plate 1 is clamped by sandwiching the side edges of the plate and tightening it with, for example, bolts (not shown). The interval between the feed screws 32 and 33 is set to be larger than the length of the thin plate 1 in the Y direction.

The operation of holding and moving the thin plate 1 in this processing apparatus will be described.

The thin plate 1 is held by the pair of holding bodies 30 and 31. The feed screw 32, 3,
When 3 is rotationally moved, the holding body 31 moves along the X direction, and the distance between the pair of holding bodies 30 and 31 changes. Therefore,
The thin plate 1 is horizontally arranged between the pair of holding bodies 30 and 31,
The distance between the holding bodies 30 and 31 is adjusted to the length of the thin plate 1 in the X direction. The holding bodies 34, 34 provided on the holding bodies 30, 31 hold and fix the side edges of the thin plate 1 in the X direction. In this case, the thin plate 1
The punch unit 11 is located on the upper side of the plate 1, and the receiver unit 12 is located on the lower side of the thin plate 1.

Then, when the feed screw 28 is moved in the X direction by driving the motor mounted on the moving body 24, the holding body 30 moves in the X direction, and the holding body 31 moves via the feed screws 32 and 33. .. Therefore, the thin plate 1 held by the holders 30 and 31 moves in the X direction. By driving the motor finely, the thin plate 1 can be moved intermittently at a small pitch. When the feed screw 26 is moved in the Y direction by the motor 27, the moving body 23 moves in the Y direction, and the moving bodies 22, 23, 24 move in the Y direction on the guide rail 25 via the feed screw 28. Therefore, the holders 30 and 31 move in the Y direction, and the thin plate 1 moves in the Y direction. By thinly driving the motor 27, the thin plate 1
Can be moved intermittently at a small pitch. The feed screw 20 is rotated by the motor 21 and the lift plate 18 is moved to the Z position.
When moved in the direction, the holders 30 and 31 move in the Z direction and the thin plate 1 moves in the Z direction. By thinly driving the motor 21, the thin plate 1 can be intermittently moved at a small pitch.

Next, the structure for holding and replacing the punch unit 11 will be described with reference to FIGS.

The unit body 11a of the punch unit 11
Are vertically arranged in a cylindrical shape for accommodating the punch 14 and each pressing body 15. At the upper end of the unit main body 11a, ring portions 38 and 39 are formed vertically spaced apart. Further, as shown in FIGS. 4 and 5, a hole 40 for inserting the punch unit 11 is formed in the frame 13. The frame 13 has a pneumatic cylinder 4
1 is provided, and an engagement body 43 is attached to a pinstone 42 provided on the pneumatic cylinder 41. The engagement body 43 is inserted into the hole 40 of the frame 13 in the punch unit body 1
When 1 is inserted, it engages with the annular portion 39 at the upper end of the unit main body 11a. The frame 13 is provided with an air supply pipe 44 for supplying high pressure air for driving to an air cylinder inside the unit body 11a, which can be connected to and disconnected from the unit body 11a.

As shown in FIG. 3, a punch holding disc 45 is horizontally arranged adjacent to the frame 13.
5 is intermittently rotated by a rotating shaft 46 (not shown).
The disk 45 has a plurality of holes 47 at intervals in the circumferential direction.
Are formed. Plural types of punch units 11 having punches 14 having different diameters are fitted and held in the respective holes 47.

An arm 48 is horizontally provided between the frame 13 and the disk 45, and the arm 48 is attached to a rotary lifting shaft 49 driven by a rotary lifting mechanism (not shown). As shown in FIGS. 6 and 7, a pneumatic cylinder 50 is provided on the arm 48, and an engagement body 52 is attached to a pin stone 51 provided on the pneumatic cylinder 50. The engagement body 52 is provided on the unit body 11a when the punch unit body 11 is held in the hole 47 of the disk 45.
It engages with the annular portion 38 at the upper end of the. A case where the punch unit 11 is replaced based on such a configuration will be described.

When the punch unit 11 is mounted on the frame 13, the punch unit 11 is inserted through the hole 40 of the frame 13 and the pneumatic cylinder 41 is driven to engage the engagement body 43 with the annular portion 39 of the unit body 11a. To do. As a result, the punch unit 11 is held by the frame 13. The air supply pipe 44 is connected to a punch provided in the punch unit 11 and a pneumatic cylinder for driving the pressing body. In this state, the punch unit 11 is driven.

When replacing the punch unit 11,
The rotation lifting shaft 49 rotates the arm 48 to the upper side of the frame 13 and lowers it. Pneumatic cylinder 50 of arm 48
The engagement body 52 is engaged with the annular portion 38 of the unit main body 11a by driving. As a result, the punch unit 11 is held by the arm 48. Pneumatic cylinder 4 of frame 13
The driving force of 1 disengages the engaging body 43 from the annular portion 39 of the unit main body 11a. As a result, the punch unit 11 is released from the holding of the frame 13. The air supply pipe 44
Is removed from the unit main body 11a.

The arm 48 is lifted by the rotating lifting shaft 49 to rotate from the upper side of the frame 13 to the upper side of the disk 45,
The arm 48 is lowered again. At this time, the punch unit 11 held by the arm 48 is fitted into the hole 47 in the disk 45. The engagement body 52 is disengaged from the annular portion 38 of the unit main body 11a by driving the pneumatic cylinder 50. Then, the disc 45 is rotated to move the hole 47 of the disc 45.
The punch unit 11 to be replaced out of the punch units 11 fitted to is positioned below the arm 48. By driving the pneumatic cylinder 50, the engagement body 52 is engaged with the annular portion 38 of the unit main body 11a. Then the arm 48
Is rotated to the upper side of the frame 13 and lowered, and the punch unit 11 is held by the arm 48 by the operation opposite to the above operation. In this way, the punch unit 11 is replaced.

Next, a processing method for forming the recess 2 in the thin plate 1 using the processing apparatus will be described.

When forming the concave portion 2, the punch unit 11 and the receiver unit 12 stand still at a fixed position, and the thin plate 1 is displaced in the X, Y and Z directions as described above. In this embodiment, processing by the punch 14 is performed in three steps. At the time of processing, as shown in FIGS. 10 to 15, a punch unit 11 having a punch 14 for forming the recesses 2a, 2b, 2c and a punch 35 for correcting the peripheral surface of the recess 2c as shown in FIG. 16 are provided. The punch unit 11 and the punch 53 forming the groove portion 4 are prepared as the punch unit 11.

Punch 1 forming recesses 2a, 2b, 2c
Punch unit 11 having 4 is first frame 1
Hold 3. The disk 45 holding the punch unit 11 holds the punch unit 11 including the punch 35 that corrects the peripheral surface of the recess 2c and the punch 53 that forms the groove 2d.

Further, as described above, the thin plate 1 is held by the holding bodies 30 and 31. In this case, the holding body 31 is slightly moved in the direction away from the holding body 30, and the holding bodies 30 and 31 are moved in the X direction. Gives a pulling force along.

First, as shown in FIG. 1, FIG. 10 and FIG. 11, the first stage recess 2 is formed in the thin plate 1. Figure 1 (a)
As shown in FIG. 5, in the punch unit 11, the pressing body 15 is lowered to the upper surface of the thin plate 1 by the pneumatic cylinder, and in the receiving unit 12, the pressing body 17 is pressed by the pneumatic cylinder.
Rises to the lower surface of and presses the thin plate 1 with both. The punch receiver 16 of the receiver unit 12 is lowered with respect to the thin plate 1 at the same distance as the processing depth of the punch 14.
The punch 14 of the punch unit 11 is moved down by a pneumatic cylinder, and the portion of the thin plate 1 located directly below the punch 14 is pushed toward the lower side of the thin plate 1. Here, a plurality of pressing bodies 15 that surround the punch 14 and a plurality of pressing bodies 17 that surround the receiving body 16 press the portion of the thin plate 1 located directly below the punch 14. Therefore, when the portion where the lower end of the punch 14 is located directly below the punch 14 is pushed downward, only this portion can be pushed into the space between the pressing bodies 17 from the upper side. The punch 14 is lowered at the same distance as the working depth required for the first-step working. When the punch 14 descends by a predetermined distance, the lower end of the portion of the thin plate 1 pushed by the punch 14 reaches the upper end of the punch receiver 16 and stops. As a result, the thin plate 1 has a diameter corresponding to the diameter of the punch 14 and the punch 14
A dent 3 having a depth corresponding to the descending distance is formed so as to project downward. In this case, since the pressing members 15 and 17 press the thin plate 1, wrinkles do not occur in the depression 3.

After forming the depression 3, the punch 14 and the pressing body 15 are raised, and the receiving body 16 and the pressing body 17 are lowered to separate them from the thin plate 1.

As shown in FIG. 1 (d), the thin plate 1 is, for example, X.
Along the direction, for example, a distance of ¼ of the diameter of the recess 3 is displaced toward the center of the thin plate.

As shown in FIG. 1B, the punch unit 1
Each pressing body 14 of No. 1 is lowered, each pressing body 17 of the receiving body unit 12 is raised, and both press the thin plate 1. In this case, a part of the pressing body 15 and the pressing body 17 presses the unprocessed flat surface portion of the thin plate 1, and the other pressing body 15 and the pressing body 17 press the processed recessed portion 3. The punch receiver 16 is lifted to a position having the same distance as the working depth of the punch 14 with respect to the thin plate 1. The punch 14 is lowered, and the portion located directly below the punch 14 is pushed into the inside of the pressing body 17 and pushed down to the punch receiving body 16. As a result, the thin plate 1 has a depression 3
Is adjacent to and partially overlaps the dent 3, and the second dent 3
Is formed.

Further, as shown in FIG. 1 (d), the thin plate 1 is moved, for example, along the X direction by a distance of 1/4 of the diameter of the recess 3 to move the punch unit 11 and the receiver unit 12 as described above. In operation, the third recess 3 is formed in the thin plate 3 as shown in FIG. After forming a plurality of recesses 3 along the X direction, the thin plate 1 is moved in the Y direction by the radius of the recess 3 to form a plurality of recesses 3 again on the thin plate 1 along the X direction.

As described above, the punch 14 having the cross-sectional area smaller than the area of the bottom surface of the recess 2 is used to repeatedly form the thin plate 1 with the depth dimension smaller than that of the recess 2 so as to form the depression 3. As shown in FIGS. 10 and 11, a thin plate 1 has a bottom surface portion in which a large number of depressions 3 are arranged, and a first-stage concave portion 2a having a smaller depth than the concave portion 2 is formed.

Here, the processing for forming the depression 3 in the thin plate 1 with the punch 14 is such that the depth of the punch 14 pushing the thin plate 1 divided by the diameter of the punch 14 is in the range of 0.1% to 30%. Done in. By punching in this range, it is possible to prevent the thin plate 1 from being subjected to uneven stretching deformation as in deep drawing. If the working ratio is less than 0.1%, punching cannot be efficiently performed, and if it exceeds 30%, uneven stretching deformation occurs in the thin plate 1. It is preferably 10% to 20%.

In punching, a plurality of pressing bodies 15 surrounding the punch 14 and a plurality of pressing bodies 17 surrounding the receiving body 16 individually operate to press the portion of the thin plate 1 located directly below the punch 14. .. Therefore, each presser body 15, 1
It is possible to surely press the portion of the thin plate 1 to be punched by the punch 7 in an appropriate state according to its shape, to reliably and easily form the depression 3 by the punch 14, and to prevent the depression 3 from wrinkling.

A tensile force is applied to the thin plate 1 so that the thin plate 1
When the punching process is performed, the pressing body 15 is pressed against the thin plate 1
It is backing up holding down. Therefore, the recess 3 can be formed with higher accuracy in punching. Therefore, the bottom surface of the concave portion 2a is formed with a large number of depressions 3 arranged in order at a constant height. After forming the first-stage recess 2a, the second-stage recess 2b is formed as shown in FIGS. The depth of the second-stage recess 2b is the same as that of the first-stage recess 2a, for example.
Therefore, the thin plate 1 is raised with a distance corresponding to the depth of the recess 2b in the second stage. Then, in the same manner as described above, a large number of recesses 3 are formed on the bottom surface of the recess 2b by the punch 14, and the recess 2b extending further downward is formed below the recess 2a. In this case, the recesses 2 are formed by shifting the positions with respect to the respective recesses 3 formed in the recesses 2a in the first stage.
The flatness of the bottom part of b is raised.

Further, subsequently, by the same operation, as shown in FIGS. 14 and 15, a large number of depressions 3 are formed side by side on the bottom surface of the recess 2b in the second stage, and the lower portion of the bottom surface of the recess 2b is extended to form the first recess. A three-step recess 2c is formed. here,
The recess 3 is formed by shifting the position with respect to the recess 3 of the recess 2b in the second stage, and the flatness of the bottom surface of the recess 2c is increased.

Further, as shown in FIGS. 16 and 17, the peripheral edge of the bottom surface of the recess 2c and the peripheral edge surface of the recess 2c are continuously pressed by the punch 35 to enhance the flatness of these portions. The punch 35 has a smaller diameter than the punch 14. In this case, the punch 1
The punch unit 11 having 4 is removed from the frame 13 and transferred to the disk 45, and instead, the punch unit 11 having the punch 14 is removed from the disk 45 and mounted on the frame 13.

Next, as shown in FIGS. 13 and 14, the recess 2c of the thin plate 1 is finished. That is, the finishing die 36 and the die receiver 37 that receives the die 36 are prepared in the processing apparatus. The finishing die 36 has the same shape as the final shape of the concave portion 2 of the thin plate 1 and has a pressing portion on the outer peripheral portion, and the die receiver 37 has a die shape. The finishing die 36 is attached to a dedicated drive device provided in the processing device.

Then, the concave portion 2 of the thin plate 1 is fitted into the mold receiving body 36, and the non-processed portion of the thin plate 1 is placed on the upper surface of the mold receiving body 36. The finishing die 36 is processed and fitted into the recess 2 of the thin plate 1. The pressing part of the finishing die 36 presses the non-processed part of the thin plate 1. As a result, the recess 2 having the required final shape is formed in the thin plate 1. That is, as shown in FIG. 22, the concave portion 2 has a bottom surface portion and a peripheral surface portion which form a right angle.

Further, processing is performed to form the groove 4 on the bottom surface of the recess 2.

As shown in FIGS. 20 and 21, two rows of recesses are formed on the bottom surface of the recess 2 by the punch 53 to form the groove 4. In this case, the punch unit 11 having the punch 35 is detached from the arm 13 and transferred to the disc 45 by the above-described operation, and instead, the punch unit 11 having the punch 53 is detached from the disc 45 and the arm 1 is moved.
Attach to 3.

Then, the finishing die 54 shown in FIG. 22 is used to finish the groove portion 4. In the above-mentioned embodiments, in order to perform processing using the punch unit 11, three types of punch units 11 having different diameters are prepared, and these punch units are selected and replaced according to the progress of processing. ing. That is, in the processing for forming the concave portion 2, the punch unit 11 having the punch 14 is used first, and then the punch unit 11 having the punch 35 is used. By properly using such punches, the concave portion 2 having a predetermined shape can be accurately formed,
And it can be formed efficiently.

Further, by punching the bottom of the recess 2 from the punch unit 11 having the punch 35 to the punch unit 11 having the punch 53, a complicated shape in which the recess 2 and the groove 4 are combined is obtained. Can also be easily formed.

As shown in FIG. 17, the processing apparatus of this embodiment controls the drive of the punch unit 11, the receiver unit 12, and the motors by using the control unit 55, that is, the punch 14 is the processing portion of the thin plate 1. The shape is inspected, the processing amount of the processing portion to be processed next is determined, and the drive of the punch unit 11, the receiver unit 12, and each motor is controlled.

A specific example of a method of processing a thin plate to form the product shown in FIG. 21 will be described. The thin plate is made of aluminum alloy (AA5182) and is 1000mm long x 2 wide.
It is 000 mm x 1 mm thick. The recess is 600mm long x 12 wide
It is 00 mm x 25 mm in depth. A punch having a diameter of 200 mm is used for the processing for forming the recess, and the processing depth for one time is 12.5 mm.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways. For example, the pressing body 17 provided in the receiving body unit 12 may be formed integrally with the punch receiving body 16.

The product to which the present invention is applied is not limited to the above-described embodiment, and a product in which the thin plate 1 is provided with the concave portion 2 having the shape shown in FIGS. 25 and 26 as shown in FIGS. 18 and 19 can also be applied. ..

[0062]

As described above, according to the method for processing a difficult-to-machine metal thin plate of the present invention, a punch is used to give a large number of small elongation deformations to the thin plate, and the depth is larger than that of the recess to be finally formed. Is formed by projecting a shallow recess, and the recess having a predetermined depth is formed by stacking the recesses in a plurality of steps to form the entire recess by stacking small stretch deformations of thin plates. It is possible to form not only the peripheral surface portion of the base material but also the bottom surface portion thereof to form the recess. Then, it is possible to specify the degree of processing of a single process of forming a depression in the thin plate by the punch, and prevent the punching process from giving uneven stretching deformation to the thin plate as in deep drawing.

In particular, in the first step, punches of a plurality of types are prepared, and the punches are selected and replaced according to the progress of the machining to perform the punching. Therefore, the punching can be efficiently performed.
It is possible to quickly form a highly accurate recess. Also,
Even a recess with a complicated shape can be easily formed by selecting the type of punch.Therefore, a thin plate made of a difficult-to-process metal can be easily deformed to efficiently form a recess without causing cracks. It is possible to manufacture a product in which a recess is formed in a thin plate made of processed metal with a high yield.

[Brief description of drawings]

1A to 1C are views showing a process in which a punch processes a substrate in an embodiment of a method for processing a difficult-to-machine metal thin plate according to the present invention. (D) is a figure which shows the moving process of the thin plate at the time of punching.

FIG. 2 is a perspective view showing a processing apparatus used in the embodiment.

FIG. 3 is a perspective view showing a schematic configuration of a mechanism for exchanging punches in the processing apparatus of the embodiment.

FIG. 4 is a plan view showing a mechanism for holding the punch at a processing position in the processing apparatus.

FIG. 5 is a side view showing a mechanism for holding the punch at a processing position in the processing apparatus.

FIG. 6 is a plan view showing a mechanism for holding the punch at a replacement position in the processing apparatus.

FIG. 7 is a side view showing a mechanism for holding the punch in a replacement position in the processing apparatus.

FIG. 8 is a front view showing a punch and a punch receiver used in the embodiment.

FIG. 9A is a bottom view showing a punch. (B) is a plan view showing the punch receiver.

FIG. 10 is a plan view showing a thin plate punched in the process of forming a recess in the thin plate according to the embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a thin plate punched in the process of forming a recess in the thin plate.

FIG. 12 is a plan view showing a thin plate punched in the process of forming a recess in the thin plate.

FIG. 13 is a cross-sectional view showing a thin plate punched in the process of forming a recess in the thin plate.

FIG. 14 is a plan view showing a thin plate punched in the process of forming a recess in the thin plate.

FIG. 15 is a sectional view showing a thin plate punched in the process of forming a recess in the thin plate.

FIG. 16 is a plan view showing a thin plate punched in the process of forming a recess in the thin plate.

FIG. 17 is a cross-sectional view showing a thin plate punched in the process of forming a recess in the thin plate.

FIG. 18 is a cross-sectional view showing finishing in the process of forming a recess in a thin plate.

FIG. 19 is a cross-sectional view showing finishing in the process of forming a recess in a thin plate.

FIG. 20 is a plan view showing a punched thin plate that further forms a recess in the recess.

FIG. 21 is a cross-sectional view showing a thin plate that has been punched to form a recess in the recess.

FIG. 22 is a perspective view showing a mold used for finishing the recess formed in the recess.

FIG. 23 is a perspective view showing a thin plate having a recess.

FIG. 24 is a block diagram showing the operation of the processing apparatus according to the embodiment of the present invention.

FIG. 25 is a plan view showing another example of a thin plate having a recess.

FIG. 26 is a cross-sectional view showing another example of a thin plate having a recess.

[Explanation of symbols]

1 ... Thin plate, 2 ... Recessed part, 14 ... Punch, 15 ... Holding body, 1
6 ... Punch receiving, 17 ... Pressing body.

Claims (1)

Claim: What is claimed is: 1. A method of forming a recess in a thin plate made of a difficult-to-machine metal, the recess protruding from the thin plate, the punch having a cross-sectional area smaller than the area of the bottom surface of the recess. A receiving body that surrounds the punch and a punch receiving body that receives the punch are prepared, and while the pressing body holds the thin plate, the punch presses the thin plate to a depth that is smaller than the depth of the recess. Repeatedly press the punch receiving body to form a recess in the thin plate,
A first step of forming a recess in the thin plate while performing a recess forming process for protruding the thin plate in the same planar shape as the recess in a plurality of times and sequentially increasing the protruding depth for each recess forming process; Preparing a finishing die having the same size and shape as the concave portion and a die receiving body for receiving the finishing die, placing the thin plate on the die receiving body, and pushing the finishing die into the concave portion of the thin plate to finish the concave portion. A second step of finishing into a shape, the step of forming a recess in the thin plate with the punch in the first step, a value obtained by dividing the depth of the punch to push the thin plate by the diameter of the punch, It is performed in the range of 0.1% to 30%, and in the first step, a plurality of types of punches are prepared, and these punches are selected and replaced according to the progress of processing. Thin plate Processing method.